Deprecate MarkStableRequest.android_gts_build_branch

BUG=chromium:1074145
TEST=./generate.sh

Change-Id: Ia2108086e8aabe5968f5354372c276e33a030ae2
Reviewed-on: https://chromium-review.googlesource.com/c/chromiumos/infra/proto/+/2162417
Tested-by: Shao-Chuan Lee <shaochuan@chromium.org>
Auto-Submit: Shao-Chuan Lee <shaochuan@chromium.org>
Reviewed-by: Kazuhiro Inaba <kinaba@chromium.org>
Reviewed-by: Ned Nguyen <nednguyen@google.com>
Commit-Queue: Shao-Chuan Lee <shaochuan@chromium.org>
2 files changed